var async = require('async');
var task1 = function(callback){
  console.log("task1");
  callback(null,"task1")
}
var task2 = function(callback){
  console.log("task2");
  callback(null,"task2")
}
var task3 = function(callback){
  console.log("task3");
  callback(null,"task3")
}

async.series([task1,task2,task3]);
